Modeling a coin - how to

Hello to everyone,
I'm a CS student and never have worked in Solidworks until yesterday. As every powerful tool, it seems extremely complicated at first and I will definitely need to pass a few tutorials online along with a book I have before I can even think starting to do something.

Anyway, within one of general computer graphics courses, I got an assignment to make a 3D model of a coin in SW. Of course I can't just download some model, I need to make it. Now, what I'm kindly asking is just to give me a few very general directions, what to watch for and steps that I'll need to do to make it from, say, a pic as a reference.

Thanks!

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